Daycare centres in Sweden are using GPS systems and other electronic tracking devices to keep tabs on children on excursions.

The practice is raising ethical queries, with parents worried that centres will use the technology in place of staff and others debating personal violation in putting a GPS transmitter on a child.

Monica Blank-Hedqvist, principal of a daycare centre in the city of Borlange, called the system "excellent". Staff used the devices on forest walks, when youngsters wore vests with transmitters that allowed tracking via a screen.